EP3518711B1 - Coffee machine with improved movement system of the brewing cylinder - Google Patents

Coffee machine with improved movement system of the brewing cylinder Download PDF

Info

Publication number: EP3518711B1
Authority: EP; European Patent Office
Prior art keywords: nut screw; screw; coffee machine; support; brewing cylinder
Prior art date: 2016-09-27
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Active

Application number

EP17777558.2A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP3518711A1 (en

Inventor

Giuseppe De' Longhi

Paolo EVANGELISTI

Floriano FRANZON

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

De Longhi Appliances SRL

Original Assignee

De Longhi Appliances SRL

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2016-09-27

Filing date

2017-09-26

Publication date

2020-04-29

2017-09-26 Application filed by De Longhi Appliances SRL filed Critical De Longhi Appliances SRL

2017-09-26 Priority to PL17777558T priority Critical patent/PL3518711T3/pl

2019-08-07 Publication of EP3518711A1 publication Critical patent/EP3518711A1/en

2020-04-29 Application granted granted Critical

2020-04-29 Publication of EP3518711B1 publication Critical patent/EP3518711B1/en

Status Active legal-status Critical Current

2037-09-26 Anticipated expiration legal-status Critical

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Classifications

- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J31/00—Apparatus for making beverages
- A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
- A47J31/34—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure
- A47J31/36—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means
- A47J31/3604—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means with a mechanism arranged to move the brewing chamber between loading, infusing and ejecting stations
- A47J31/3609—Loose coffee being employed
- A47J31/3614—Means to perform transfer from a loading position to an infusing position

Definitions

the present invention relates to a coffee machine comprising a brewing cylinder that is subjectable to reversible displacement from a disengagement position to an engagement position with a closing piston to create a brewing chamber in which the hot brewing water is conveyed that comes from a suitable boiler.
the movement of the brewing cylinder can be translational or rototranslational and uses a movement system that in many cases comprises a nut screw engaged and guided to translate along a screw.
the brewing cylinder is supported by a support in turn supported by the nut screw that is driven by the suitably motorised screw.
EP-A-2036466 discloses a coffee machine comprising a brewing cylinder and a movement system of said brewing cylinder comprising a nut screw engaged with a motorised screw according to the preamble of claim 1.
the technical task that this invention proposes is thus to provide a coffee machine that enables the technical drawbacks complained of in the prior art to be eliminated.
an aim of the invention is to provide a coffee machine that limits wear to the members of the movement system of the brewing cylinder, thus extending the life cycle thereof.
Another object of the invention is to provide a coffee machine capable to operate in a very silent manner.
Another object of the invention is to provide a coffee machine that ensures a reduction of routine maintenance.
a coffee machine comprising a brewing cylinder and a movement system of said brewing cylinder comprising a nut screw engaged with a motorised screw, characterised in that it has elastic means compensating the mechanical backlash present between the threads of said screw and said nut screw.
the movement system of the brewing cylinder preferably comprises a support of the brewing cylinder, said nut screw supporting said support of the brewing cylinder, said motorised screw, and a translation guide of said nut screw along said screw.
said elastic means comprises an auxiliary nut screw engaged with said screw and guided in translation along said screw, and at least one tensioned elastic element connecting said nut screw supporting said support and said auxiliary nut screw.
the presence of the compensating elastic means ensures the maintenance of a contact force between the sides of the threads of the screw and of the nut screw supporting said support during movement of the brewing cylinder.
the compensation of the mechanical backlash by elastic means enables the service life of the coffee machine to be extended, or, higher performance standards over the same length of service life to be ensured.
a coffee machine 1 has a brewing unit comprising a hollow brewing cylinder 2 having an access mouth 3 engageable by a closing piston 4 for delimiting a brewing chamber 5 in which a load of coffee is positionable.
the brewing cylinder 2 is subjectable to a reversible rototranslational stroke between a coffee load loading position, in which it is disengaged from the closing piston 4 and has the axis tilted to the axis of the closing piston 4, and a brewing position in which it is sealingly engaged with the closing piston 4 and has the axis in the direction of the axis of the closing piston 4.
ejection piston 6 Inside the brewing cylinder 2 there is an ejection piston 6 that is slidable in the direction of the axis of the brewing cylinder 2 between a retracted position and an extended position for ejecting the load of spent coffee grounds.
the ejection piston 6 can be driven in a known manner by suitable, not shown cams.
the brewing cylinder 2 is fixed, preferably but not necessarily in a removable manner, to a support 7 that is translatable in the direction of the axis of the closing piston 4.
the support 7 is supported by a nut screw 8 engaged with a constant pitch screw 9 oriented in the direction of the axis of the closing piston 4 and rotatingly movable on itself by a suitable geared motor 10.
the nut screw 8 is constrained to a translation guide 11 that prevents rotation thereof on itself when it is driven by the screw 9.
the translation guide 11 of the nut screw 8 is formed by two "C"-shaped profiles 16 that are fixed to the frame of the coffee machine 1 in which wings 17 diametrically opposite the supporting nut screw 8 are guided to slide.
the nut screw 8 also has a pin 12 for supporting the support 7 in an oscillatable manner with an oscillation axis oriented in a direction that is orthogonal to the translation direction thereof.
the support 7 interferes in a known manner with suitable cams that are not shown.
the brewing unit operates as follows.
the brewing cylinder 2 is at the start of the stroke with the axis in a vertical direction or a little tilted with respect to the vertical direction.
the ejection piston 6 is in a retracted position in the brewing chamber 5.
the geared motor 10 rotates the screw 9 that translates upwards the nut screw 8 and consequently the support 7 supported by the nut screw 8 and the brewing cylinder 2 supported by the support 7.
the support 7 oscillates until it orientates the brewing cylinder 2 with an axis aligned on the axis of the closing piston 4.
the brewing cylinder 2 maintains the same angular orientation and thus engages with the closing piston 4.
the brewing cylinder 2 stops in this position with the ejection piston 6 still in the retracted position.
the closing piston 4 is supplied with a flow of water that is specially heated in a suitable boiler (not shown).
the hot brewing water is injected into the brewing chamber and the resulting brewed beverage is extracted through a suitable outlet port provided in the brewing cylinder 2.
the descent of the brewing cylinder 2 concludes with an oscillation contrary to the initial oscillation with which it returns to the position of loading a new load of coffee.
the novel aspect of the coffee machine 1 relates to the specific provision of elastic means 13 compensating the mechanical backlash between the threads of the screw 9 and of the nut screw 8 supporting the support 7.
the compensating elastic means 13 comprises an auxiliary nut screw 14 engaged with the screw 9 and guided in translation along the screw 9 itself, and at least one tensioned elastic element 15 connecting the nut screw 8 supporting the support 7 and the auxiliary nut screw 14.
the compensating elastic element 15 consists of an axial element having an end 15a engaging with the supporting nut screw 8 and an end 15b engaging with the auxiliary nut screw 14.
the elastic element 15 consists in particular of a helical spring having one end resting against the supporting nut screw 8 and the other end resting against the auxiliary nut screw 14.
the elastic element 15 is a tensioned helical spring having one end fixed to the supporting nut screw 8 and the other end fixed to the auxiliary nut screw 14.
the elastic element 15 is a tensioned helical spring having one end fixed to the supporting nut screw 8 and the other end fixed to the auxiliary nut screw 14.
the auxiliary nut screw 14 has a first cylindrical tube-shaped element 14a, a second cylindrical tube-shaped element 14b that is coaxial with and inside the first element 14a, and a base 14c that supports on the same side the first and the second elements 4a, 14b.
the second element 14b internally has a thread by means of which the supporting nut screw 8 engages with the screw 8.
the second element 14b delimits with the first element 14a a gap in which the helical spring is positioned that thus remains housed between the gap and the upper end of the supporting nut screw 8.
the base 14c of the auxiliary nut screw 14 is further open centrally for the passage of the screw 9.
the auxiliary nut screw 14 has lastly one or more hooking members 18 for hooking to the supporting nut screw 8.
the hooking members 18 are shaped as elastically yieldable teeth that are snap-fittable in suitable hooking seatings 20 provided in the supporting nut screw 8 and more precisely in the wings 17 thereof.
the hooking members 19 are supported externally on the first element 14a and extend on the extension of the cylindrical generators of the latter on the side opposite the base 14c.
the supporting nut screw 8 is first tightened on the screw 9, then the helical spring is fitted on the screw 9 and lastly the auxiliary nut screw 14 is tightened on the screw 9.
the auxiliary nut screw 14 whilst it is being tightened on the screw 9, gradually compresses the helical spring against the supporting nut screw 8 until the hooking members 19 are taken to the hooking seatings 20.
the supporting nut screw 8 and the auxiliary nut screw 14 are integral with one another in translation along the screw 9 net of any mechanical backlash between the threads thereof and the threads of the screw 9.
the degree of compression of the helical spring remains unvaried.
the compressed helical spring constantly maintains a contact force between the threads of the supporting nut screw 8 and the threads of the screw 9.
the helical spring keeps the threads of the auxiliary nut screw 14 pressed against the threads of the screw 9 and on the other side keeps the threads of the supporting nut screw 8 against the threads of the screw 9.
the supporting nut screw 8 has in this case at the bottom an anti-rotation guide (not shown) in which suitable diametric wings 140 of the auxiliary nut screw 14 are engaged that is thus constrained integrally in translation to the supporting nut screw 8.
the supporting nut screw 8 normally rests with the upper side of the thread thereof against the lower side of the thread of the screw 9.
the friction forces acting on the supporting nut screw 8 are the same as to the elastic force generated by the elastic element 15, so that the support rest is maintained between the upper side of the thread of the supporting nut screw 8 and the lower side of the thread of the screw 9.
the movement forces of the ejection piston 6, which are generated by suitable cams that are not shown, are the same as the elastic force generated by the elastic element 15, and in particular both the extraction force necessary for unloading the spent coffee grounds from the brewing chamber, and the retraction force necessary for returning the brewing chamber to a suitable configuration for receiving a new load of coffee.
Another advantage of the constructional variant illustrated in figures 6, 7 is related to the fact that when the brewing unit reaches the brewing configuration in which the brewing cylinder 2 is engaged with the closing piston 4, the elastic force exerted by the elastic element 15 is overcome by the force exerted in the opposite direction by the closing piston 4 on the brewing cylinder 2. Accordingly, in the brewing configuration, the lower side of the thread of the supporting nut screw 8 rests against the lower side of the thread of the screw 9. In practice, in this configuration of the brewing unit, where there are great forces at play that could damage the thread of the supporting nut screw 8, the integrity is preserved completely of the upper side of the thread of the supporting nut screw 8 operating during movement of the brewing unit.
the materials used, as well as the dimensions, can be any according to the needs and the state of the art.

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Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Food Science & Technology (AREA)
Apparatus For Making Beverages (AREA)
Tea And Coffee (AREA)

EP17777558.2A 2016-09-27 2017-09-26 Coffee machine with improved movement system of the brewing cylinder Active EP3518711B1 (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
PL17777558T PL3518711T3 (pl)	2016-09-27	2017-09-26	Ekspres do kawy z ulepszonym systemem ruchu cylindra parzenia

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
IT102016000096912A IT201600096912A1 (it)	2016-09-27	2016-09-27	Macchina da caffè con sistema di movimentazione migliorato del cilindro di infusione
PCT/EP2017/074415 WO2018060211A1 (en)	2016-09-27	2017-09-26	Coffee machine with improved movement system of the brewing cylinder

Publications (2)

Publication Number	Publication Date
EP3518711A1 EP3518711A1 (en)	2019-08-07
EP3518711B1 true EP3518711B1 (en)	2020-04-29

Family

ID=57909978

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP17777558.2A Active EP3518711B1 (en)	2016-09-27	2017-09-26	Coffee machine with improved movement system of the brewing cylinder

Country Status (5)

Country	Link
US (1)	US11470993B2 (pl)
EP (1)	EP3518711B1 (pl)
IT (1)	IT201600096912A1 (pl)
PL (1)	PL3518711T3 (pl)
WO (1)	WO2018060211A1 (pl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
IT201800004967A1 (it) *	2018-04-27	2019-10-27		Macchina da caffé a funzionamento semplificato
DE202018107372U1 (de) *	2018-12-21	2020-03-24	Eversys Holding Sa	Vorrichtung zum Zuführen von Kaffeepulver in eine Brühkammer einer Kaffeemaschine

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US5865096A (en) *	1998-07-24	1999-02-02	Sanden Corp.	Coffee brewing apparatus
EP1800575B1 (en) *	2005-12-23	2009-02-25	RANCILIO MACCHINE PER CAFFE' S.p.A.	Infusion unit
EP2036466B1 (de) *	2007-09-12	2010-06-23	Schaerer AG	Brüheinrichtung für eine Kaffeemaschine
ITMI20112430A1 (it) *	2011-12-29	2013-06-30	De Longhi Appliances Srl	Gruppo di infusione per macchina da caffe'
DE102013202148A1 (de) *	2013-02-08	2014-08-14	BSH Bosch und Siemens Hausgeräte GmbH	Kaffeevollautomat mit Spindelbrüheinheit
DE102014202780A1 (de) *	2014-02-14	2015-08-20	BSH Hausgeräte GmbH	Antrieb für die Brüheinheit eines Kaffeevollautomaten

2016
- 2016-09-27 IT IT102016000096912A patent/IT201600096912A1/it unknown
2017
- 2017-09-26 WO PCT/EP2017/074415 patent/WO2018060211A1/en unknown
- 2017-09-26 US US16/337,172 patent/US11470993B2/en active Active
- 2017-09-26 PL PL17777558T patent/PL3518711T3/pl unknown
- 2017-09-26 EP EP17777558.2A patent/EP3518711B1/en active Active

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number	Publication date
US20210369040A1 (en)	2021-12-02
US11470993B2 (en)	2022-10-18
WO2018060211A1 (en)	2018-04-05
PL3518711T3 (pl)	2020-11-02
EP3518711A1 (en)	2019-08-07
IT201600096912A1 (it)	2018-03-27

Publication	Publication Date	Title
EP3518711B1 (en)	2020-04-29	Coffee machine with improved movement system of the brewing cylinder
US9814346B2 (en)	2017-11-14	Infusion unit for a coffee machine
EP2718526B1 (en)	2021-01-06	Hinge provided with elastic means and dampener
US20100236418A1 (en)	2010-09-23	Apparatus for preparation and dispensing of infusions, particularly coffee, in variable valumetric doses
US20100236417A1 (en)	2010-09-23	Apparatus for the preparation and dispensing of infusions, particularly coffee, in variable volumetric doses
US20050139080A1 (en)	2005-06-30	Machine for coffee beverage production
KR101623884B1 (ko)	2016-05-24	자동 커피머신용 원두 그라인더 장치
US9730549B2 (en)	2017-08-15	Coffee brewing device
US20100083844A1 (en)	2010-04-08	Brewing unit for a coffee machine and coffee machine comprising such a brewing unit
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IT202100024806A1 (it)	2023-03-28	Apparecchiatura per la preparazione di una bevanda tramite infusione di una sostanza alimentare
CN111362211A (zh)	2020-07-03	一种饮料压盖器
CN110353221A (zh)	2019-10-22	压缩汤料瓶供给装置

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